2.4.10~active transport and co transport

Question 1

active transport

Answer 1

movement of molecules and ions through a cell membrane from a region of lower concentration to an area of higher concentration using energy from respiration

Question 2

active transport requires

Answer 2

carrier proteins

Question 3

carrier proteins specificity

Answer 3

specific for a particular type of molecule or ion

Question 4

what does facilitated diffusion use

Answer 4

carrier proteins

Question 5

why does carrier protein require energy

Answer 5

to make it change shape

Question 6

what is the energy provided by

Answer 6

ATP produced during respiration–> is is hydrolysed to release energy

Question 7

what is active transport impotent in

Answer 7

-re-absorption of useful molecules and ions into the blood after filtration into the kidney tubes
-absorption of some products of digestion from the digestive tract
-loading sugar from the photosynthesising cells of leaves in the phloem tissue for transport around the plant
-loading inorganic ions from the soil into root hairs

Question 8

co-transport

Answer 8

coupled movement of substances across a cell membrane via carrier proteins

Question 9

transport methods co-transport

Answer 9

facilitated diffusion and active transport

Question 10

how does the co-transport of glucose work

Answer 10

-sodium ions and glucose molecules are transported into the epithelial cells via facilitated diffusion
-the facilitated diffusion can only continue if a concentration gradient is maintained
-the active transport of sodium ions out of the cell into the blood helps to maintain this gradient
-the glucose molecules exit the epithelial cell and enter the blood via facilitated diffusion